Notación sigma (sumatoria)

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Evalúa las siguientes series aritméticas:
1. $\sum_{i=1}^{10}i$
2. $\sum_{i=1}^{5}-3(i+1)$
Evalúa las siguientes series geométricas:
1. $\sum_{i=1}^3 2(\frac{1}{2})^i$

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